EVANS CITY, Pa. (AP) – Authorities say an elderly woman was killed and 10 other people injured when a freight train struck a rural transit bus carrying senior citizens and people with developmental disabilities.

Evans City police Chief Joseph McCombs says it appears the small bus entered the crossing and stopped on the tracks shortly after 8 a.m. Friday. The engineer sounded a horn and tried to stop the train, but couldn’t.

The bus came to rest about 20 feet away but did not overturn. It was carrying passengers ranging in age from the mid-20s to 92.

Police are investigating whether dense morning fog contributed to the crash in Evans City, about 25 miles northwest of Pittsburgh.